Exposure mode selecting device

G - Physics – 03 – B

Patent

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Details

G03B 7/20 (2006.01) G02B 15/00 (2006.01) G03B 19/00 (2006.01)

Patent

CA 2217072

An exposure mode selecting device uses an A-position AE mode code, an M-position AE mode code, and a no-aperture-ring AE mode code, so that a proper exposure mode is selected. When an interchangeable lens, having an aperture ring being set to an A-position, is attached to a camera body, the A-position AE mode code is set to 0 or 1 so that a program mode or a shutter speed priority mode can be selected. If the aperture ring is set to one of the M-positions, the M-position AE mode code is set to 0, 1 or 2 so that an aperture priority mode, a manual mode or a bulb mode can be selected. When an interchangeable lens having no aperture ring is attached to the camera body, the no-aperture-ring AE mode code is set to 0, 1, 2, 3 or 4 so that the program mode, the shutter speed priority mode, the aperture priority mode, the manual mode or the bulb mode can be selected.

L'invention est un dispositif de sélection de modes d'exposition qui utilise un code de mode AE de position A, un code de mode AE de position M et un code de mode AE sans bague d'ouverture pour choisir le mode d'exposition. Quand un objectif interchangeable portant une bague d'ouverture réglée à l'une des positions A est fixé à un appareil photo, le code de mode AE de position A est réglé à 0 ou 1 pour permettre de choisir le mode programme ou le mode de priorisation pour la vitesse d'obturation. Si la bague d'ouverture est réglée à l'une des positions M, le code de mode AE de position M est mis à 0, 1 ou 2 pour permettre de choisir le mode de priorisation d'ouverture, le mode manuel ou le mode ampoule. Quand un objectif interchangeable sans bague d'ouverture est fixé à l'appareil photo, le code de mode AE sans bague d'ouverture est mis à 0, 1, 2, 3, ou 4 pour permettre de choisir le mode programme, le mode de priorisation pour la vitesse d'obturation, le mode de priorisation d'ouverture, le mode manuel ou le mode ampoule.

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